diff --git a/src/CliProgram/Validation/Validators/DirectoryValidator.php b/src/CliProgram/Validation/Validators/DirectoryValidator.php
new file mode 100644
index 0000000..c7ace8c
--- /dev/null
+++ b/src/CliProgram/Validation/Validators/DirectoryValidator.php
@@ -0,0 +1,106 @@
+<?php
+
+namespace jrosset\CliProgram\Validation\Validators;
+
+use InvalidArgumentException;
+use jrosset\Collections\Collection;
+use jrosset\Collections\ICollection;
+use Stringable;
+
+/**
+ * An argument/option value validator for a directory path
+ */
+class DirectoryValidator implements IValidator {
+    use TInternalValueValidator;
+
+    /**
+     * @var ICollection<FilesystemValidationOption> The options
+     */
+    private ICollection $options;
+
+    /**
+     * Initialization
+     *
+     * @param ICollection<FilesystemValidationOption>|FilesystemValidationOption[]|FilesystemValidationOption|null $options The options
+     */
+    public function __construct (ICollection|array|FilesystemValidationOption|null $options = null) {
+        $this->setOptions($options);
+    }
+
+    /**
+     * Get a valid default value from the initial/given default value
+     *
+     * @param string|Stringable|null $default The initial/given default value
+     *
+     * @return string|bool|int|float|array|null The valid default value
+     *
+     * @throws InvalidArgumentException If the default value is not a string or null
+     * @throws InvalidArgumentException If the default directory doesn't match the options
+     */
+    public function getValidDefault (mixed $default): string|bool|int|float|array|null {
+        if ($default === null) {
+            return null;
+        }
+        if (!is_string($default) && !$default instanceof Stringable) {
+            throw new InvalidArgumentException('The default value must be a string or null');
+        }
+
+        if ($this->getOptions()->contains(FilesystemValidationOption::IsReadable) && !is_readable($default)) {
+            throw new InvalidArgumentException('The default value is not readable');
+        }
+        if ($this->getOptions()->contains(FilesystemValidationOption::IsWritable) && !is_writable($default)) {
+            throw new InvalidArgumentException('The default value is not writable');
+        }
+        if ($this->getOptions()->contains(FilesystemValidationOption::MustExists) && !file_exists($default)) {
+            throw new InvalidArgumentException('The default value doesn\'t exist');
+        }
+        return $default;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function validate (mixed $value): bool {
+        if (!is_string($value) && !$value instanceof Stringable) {
+            return false;
+        }
+
+        if ($this->getOptions()->contains(FilesystemValidationOption::IsReadable) && !is_readable($value)) {
+            return false;
+        }
+        if ($this->getOptions()->contains(FilesystemValidationOption::IsWritable) && !is_writable($value)) {
+            return false;
+        }
+        if ($this->getOptions()->contains(FilesystemValidationOption::MustExists) && !file_exists($value)) {
+            return false;
+        }
+
+        $this->setValue($value);
+        return true;
+    }
+
+    /**
+     * The options
+     *
+     * @return ICollection<FilesystemValidationOption> The options
+     */
+    public function getOptions (): ICollection {
+        return $this->options;
+    }
+    /**
+     * Replace the options
+     *
+     * @param ICollection<FilesystemValidationOption>|FilesystemValidationOption[]|FilesystemValidationOption|null $options The options
+     *
+     * @return $this
+     */
+    public function setOptions (ICollection|array|FilesystemValidationOption|null $options = null): static {
+        $this->options = match (true) {
+            $options instanceof ICollection                => $options,
+            $options instanceof FilesystemValidationOption => new Collection([$options]),
+            is_array($options)                             => new Collection($options),
+            $options === null                              => new Collection(),
+        };
+        return $this;
+    }
+}
\ No newline at end of file
diff --git a/src/CliProgram/Validation/Validators/FileValidator.php b/src/CliProgram/Validation/Validators/FileValidator.php
new file mode 100644
index 0000000..24ccaa4
--- /dev/null
+++ b/src/CliProgram/Validation/Validators/FileValidator.php
@@ -0,0 +1,72 @@
+<?php
+
+namespace jrosset\CliProgram\Validation\Validators;
+
+use InvalidArgumentException;
+use jrosset\Collections\ICollection;
+
+/**
+ * An argument/option value validator for a file path
+ */
+class FileValidator extends DirectoryValidator {
+    /**
+     * @var string|null The allowed extensions (regex pattern)
+     */
+    private ?string $extensionsPattern;
+
+    /**
+     * Initialization
+     *
+     * @param string|null                                                                                          $extensionsPattern The allowed extensions (regex pattern)
+     * @param ICollection<FilesystemValidationOption>|FilesystemValidationOption[]|FilesystemValidationOption|null $options           The options
+     */
+    public function __construct (?string $extensionsPattern = null, ICollection|FilesystemValidationOption|array|null $options = null) {
+        parent::__construct($options);
+        $this->setExtensionsPattern($extensionsPattern);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getValidDefault (mixed $default): string|bool|int|float|array|null {
+        if (($default = parent::getValidDefault($default)) === null) {
+            return null;
+        }
+        if ($this->extensionsPattern !== null && preg_match($this->extensionsPattern, $default) !== 1) {
+            throw new InvalidArgumentException('The default value has not a valid extension');
+        }
+        return $default;
+    }
+    /**
+     * @inheritDoc
+     */
+    public function validate (mixed $value): bool {
+        if (!parent::validate($value)) {
+            return false;
+        }
+        if ($this->extensionsPattern !== null && preg_match($this->extensionsPattern, $value) !== 1) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * The allowed extensions (regex pattern)
+     *
+     * @return string|null The allowed extensions (regex pattern)
+     */
+    public function getExtensionsPattern (): ?string {
+        return $this->extensionsPattern;
+    }
+    /**
+     * Replace the allowed extensions
+     *
+     * @param string|null $extensionsPattern The allowed extensions (regex pattern)
+     *
+     * @return $this
+     */
+    public function setExtensionsPattern (?string $extensionsPattern = null): static {
+        $this->extensionsPattern = $extensionsPattern;
+        return $this;
+    }
+}
\ No newline at end of file
diff --git a/src/CliProgram/Validation/Validators/FilesystemValidationOption.php b/src/CliProgram/Validation/Validators/FilesystemValidationOption.php
new file mode 100644
index 0000000..46a0c9d
--- /dev/null
+++ b/src/CliProgram/Validation/Validators/FilesystemValidationOption.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace jrosset\CliProgram\Validation\Validators;
+
+/**
+ * Options of a filesystem based validator
+ */
+enum FilesystemValidationOption {
+    case MustExists;
+    case IsReadable;
+    case IsWritable;
+}
diff --git a/tests/Commands/ReadFile.php b/tests/Commands/ReadFile.php
new file mode 100644
index 0000000..b5f2d4a
--- /dev/null
+++ b/tests/Commands/ReadFile.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace jrosset\Tests\Commands;
+
+use jrosset\CliProgram\Validation\CommandWithValidation;
+use jrosset\CliProgram\Validation\Validators\FilesystemValidationOption;
+use jrosset\CliProgram\Validation\Validators\FileValidator;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class ReadFile extends CommandWithValidation {
+    /**
+     * @inheritdoc
+     */
+    protected static $defaultDescription = 'Read a file';
+
+    /**
+     * @inheritDoc
+     */
+    protected function configure (): void {
+        parent::configure();
+
+        $this->addArgument(
+            'file',
+            InputArgument::REQUIRED,
+            'The file to read',
+            null,
+            new FileValidator(
+            /** @lang PhpRegExp */ '#\.txt$#i',
+                                   FilesystemValidationOption::IsReadable
+            )
+        );
+    }
+
+    /**
+     * @inheritDoc
+     */
+    protected function execute (InputInterface $input, OutputInterface $output): int {
+        if (($fileContent = file_get_contents($input->getArgument('file'))) === false) {
+            return Command::FAILURE;
+        }
+        $output->writeln($fileContent);
+        return Command::SUCCESS;
+    }
+}
\ No newline at end of file
diff --git a/tests/file.txt b/tests/file.txt
new file mode 100644
index 0000000..91aaf46
--- /dev/null
+++ b/tests/file.txt
@@ -0,0 +1 @@
+This is a file
\ No newline at end of file